Crosslinking of a Single Poly(ionic liquid) by Water into Porous Supramolecular Membranes

Abstract

Reversible regulation of membrane microstructures via non‐covalent interactions is of considerable interest yet remains a challenge. Herein, we discover a general one‐step approach to fabricate supramolecular porous polyelectrolyte membranes (SPPMs) from a single poly(ionic liquid) (PIL). The experimental results and theoretical simulation suggested that SPPMs were formed by a hydrogen‐bond‐induced phase separation of a PIL between its polar and apolar domains, which were linked together by water molecules. This unique feature was capable of modulating microscopic porous architectures and thus the global mechanical property of SPPMs by a rational design of the molecular structure of PILs. Such SPPMs could switch porosity upon thermal stimuli, as exemplified by dynamically adaptive transparency to thermal fluctuation. This finding provides fascinating opportunities for creating multifunctional SPPMs.

Dense Hydrogen-Bonding Network Boosts Ionic Conductive Hydrogels with Extremely High Toughness, Rapid Self-Recovery, and Autonomous Adhesion for Human-Motion Detection

“…MALDI-TOF results of as-synthesized MVIC (Figure S2 ) indicated the presence of a significant peak at 198.9 m/z, consistent with the molecular weight of MVIC. 1 H NMR spectra of MVIC in D 2 O (Figure S3 ) displayed highly resolved signals corresponding to the skeleton protons, proving the successful synthesis of MVIC monomers [ 16 ].…”

Reduced Graphene Oxide-Poly (Ionic Liquid) Composite Films of High Mechanical Performance

“…The preparation of rGO/PIL nanocomposite films is schematically illustrated in Figure 1. The monomer1-benzyl-3vinylimidazolium chloride, termed IL, carrying simultaneously an imidazolium and a phenyl functionality was synthesized through a one-step quaternization reaction of 1-vinyl imidazole with benzyl chloride; IL was then radically polymerized (Figure 1) to poly(1-benzyl-3-vinylimidazolium chloride), abbreviated here as PIL (Men et al, 2013;Grygiel et al, 2015;Shao et al, 2020;Wang et al, 2020;Zhang et al, 2020). Its chemical structure and macromolecular features were characterized and confirmed by proton nuclear magnetic resonance ( 1 H NMR) spectroscopy and gel permeation chromatography (GPC), respectively (Supplementary Figures 1, 2).…”

Ferrocene‐Containing Porous Poly(Ionic Liquid) Membranes: Synthesis and Application as Sacrificial Template for Porous Iron Oxide Films

“…[ 1–4 ] In addition to their promising features, e.g., their ionic characteristics and higher mechanical and chemical stability than their neutral counterparts, can provide a versatile range of applications in the area of sensors, [ 5,6 ] separators, [ 7,8 ] actuators, [ 9–12 ] energy devices, [ 13–16 ] bioengineering, [ 17,18 ] controlled release, [ 19,20 ] filtration, [ 21–23 ] and catalyst. [ 24–26 ] Layer‐by‐layer deposition, [ 27,28 ] templating, [ 29,30 ] and phase separation [ 31–33 ] are currently the most common methods to produce pores of different sizes and size distributions in polyelectrolyte membranes, and more new methods are on the way to be developed.…”